Boxis R700 User Manual Page 340

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ATI R700 Technology
10-26 Vertex-Fetch Instructions
Copyright © 2009 Advanced Micro Devices, Inc. All rights reserved.
FETCH_WHOLE_QUAD
(FWQ)
7int(1)
0 Texture instruction can ignore invalid pixels.
1 Texture instruction must fetch data for all pixels (result can be used as
source coordinate of a dependent read).
BUFFER_ID [15:8] int(8)
Constant ID to use for this vertex fetch (indicates the buffer address, size,
and format).
SRC_GPR [22:16] int(7)
Source GPR address to get fetch address from.
SRC_REL (SR) 23 enum(1)
Specifies whether source address is absolute or relative to an index.
0 Absolute: no relative addressing.
1 Relative: add current loop index (aL) value to this address.
SRC_SEL_X (SSX) [25:24] enum(2)
Specifies which element of SRC to use for the fetch address.
0 SEL_X: use X element.
1 SEL_Y: use Y element.
2 SEL_Z: use Z element.
3 SEL_W: use W element.
MEGA_FETCH_COUNT
(MFC)
[31:26] int(6)
For a mega-fetch, specifies the number of bytes to fetch at once. For mini-
fetch, number of bytes to fetch if the processor converts this instruction into
a mega-fetch. This value's range is [1,64].
Related VTX_WORD1_GPR
VTX_WORD1_SEM
VTX_WORD2
Vertex Fetch Doubleword 0
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